Thread: 97-03 GP's with (mostly) stock cat-backs help me out!

I was under the impression that the stock exhaust pipe size on the 97-03 GTP's was 2.5" to a split 2.25", but the last time I had my cat-back down, I measured the diameters and got 2.25" OD to a split 2.0" OD. That makes for a rather restricted exhaust...

Can someone who still has some stock exhaust do me a favor and go out and measure the OD of your pipes? I'm wondering if I was just mis-informed, or if I got screwed from the factory...

I may be in need of upgrading my cat-back before i try to drop to a smaller pulley.

All w-bodies I've seen have 2.25" catbacks stock. If they split it's 2" after the split.

your measurements are correct, and unless youre pushing some serious power then its not really a concern as far as a restriction goes.

i think youre good for another 50-100 hp before it becomes even a minimal problem. there are plenty of people running 350+ whp with stock catbacks.

That's good to know that I was just mis-informed on the sizes. Thanks for the info, guys!

/thread

Oh Dan....tsk...tsk...tsk. You're going to make me invoke the rules about posting in the wrong section and delete this thread, LOL.


Nah, I'll move it for ya, it isnt like you spray them all over the board with no regard to where they go.

oops... I forgot the tech lounge even existed... Sorry Scotty!